基于邻近超导体的非侵入式超灵敏量热计
Non-invasive thermometer based on proximity superconductor for ultra-sensitive calorimetry
摘要：
我们提出了基于超导体和邻近正常金属之间的隧道结的射频测温。它允许在广泛的偏置条件下工作。我们表明，标准的有限偏置准粒子隧穿温度计遭受大的耗散和损失的灵敏度在低温下，而基于零偏异常测温避免了这两个问题。由于这些原因，后一种方法适用于低至较低的温度，这里为约25 mK。这两个温度计示出测量相同的本地温度的电子在正常的金属在其适用范围内。
英文摘要：
We present radio-frequency thermometry based on a tunnel junction between a superconductor and proximitized normal metal. It allows operation in a wide range of biasing conditions. We demonstrate that the standard finite-bias quasiparticle tunneling thermometer suffers from large dissipation and loss of sensitivity at low temperatures, whereas thermometry based on zero bias anomaly avoids both these problems. For these reasons the latter method is suitable down to lower temperatures, here to about 25 mK. Both thermometers are shown to measure the same local temperature of the electrons in the normal metal in the range of their applicability.
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